21201100011211 has 4 divisors (see below), whose sum is σ = 21202029458424. Its totient is φ = 21200170564000.

The previous prime is 21201100011187. The next prime is 21201100011239. The reversal of 21201100011211 is 11211000110212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21201100011211 - 2⁷ = 21201100011083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201100011191 and 21201100011200.

It is not an unprimeable number, because it can be changed into a prime (21201100011251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464689390 + ... + 464735011.

It is an arithmetic number, because the mean of its divisors is an integer number (5300507364606).

Almost surely, 2^{21201100011211} is an apocalyptic number.

21201100011211 is a deficient number, since it is larger than the sum of its proper divisors (929447213).

21201100011211 is an equidigital number, since it uses as much as digits as its factorization.

21201100011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929447212.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201100011211 its reverse (11211000110212), we get a palindrome (32412100121423).

Subtracting from 21201100011211 its reverse (11211000110212), we obtain a palindrome (9990099900999).

The spelling of 21201100011211 in words is "twenty-one trillion, two hundred one billion, one hundred million, eleven thousand, two hundred eleven".